Many potential patients can see the benefit of cognitive behavioural hypnotherapy (CBT with hypnosis), psychotherapy or hypnotherapy.
However, in my experience, it is often difficult for a patient to understand how a purely psychological therapy is able to treat conditions that are physical, for example eczema, excessive perspiration, blushing, high blood pressure, IBS or pain.
A good way of looking at this is to observe how stress and anxiety affect the body. Stress may be caused by purely emotional disturbances, but the responses of the body are very physical. Although no physical harm has been caused to the body and no toxic substance ingested or applied, a variety of obvious symptoms may be apparent.